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Basic Dropdown
                                        
    <div  class="dropdown">
        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
        </div>
    </div>
                                        
                                    
Dropdown Scrollable Content
                                        
    <div class="dropdown">
        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown Click
        </button>
        <div class="dropdown-menu p-3" data-scrollable="true" data-height="220">
            <p>...</p>
            <p>...</p>
        </div>
    </div>
                                        
                                    
Dropdown Sizing
Just adding .dropdown-menu-md on .dropdown-menu get medium dropdown menu
                                        
    <div  class="dropdown">
        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu dropdown-menu-md">
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
        </div>
    </div>
                                        
                                    
Just adding .dropdown-menu-lg on .dropdown-menu get large dropdown menu
                                        
    <div  class="dropdown">
        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu dropdown-menu-lg">
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
        </div>
    </div>
                                        
                                    
Dropdown Directions
Dropup Trigger dropdown menus above elements by adding .dropup to the parent element.Dropright Trigger dropdown menus above elements by adding .dropright to the parent element.Dropleft Trigger dropdown menus above elements by adding .dropleft to the parent element.
Dividers Dropdown
                                        
    <div  class="dropdown">
        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
            <div class="dropdown-divider">
                <a href="#" class="btn btn-sm btn-pill btn-brand">Submit</a>
            </div>
        </div>
    </div>
                                        
                                    
Dropdown Child's
                                        
    <div  class="dropdown">
        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown
        </button>
        <div class="dropdown-menu">
            <div class="dropdown-head">
                Dropdown head
            </div>
            <div class="dropdown-body">
                <a class="dropdown-item" href="#">...</a>
                <a class="dropdown-item" href="#">...</a>
                <a class="dropdown-item" href="#">...</a>
            </div>
            <div class="dropdown-foot">
                Dropdown foot
            </div>
        </div>
    </div>
                                        
                                    
Split Button
                                        
    <div  class="btn-group">
        <button type="button" class="btn btn-primary">Dropdown</button>
        <button class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <span class="sr-only"">Toggle Dropdown</span>
        </button>
        <div class="dropdown-menu">
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
            <a class="dropdown-item" href="#">...</a>
        </div>
    </div>
                                        
                                    
Dropdown Button Sizing
Button dropdowns work with buttons of all sizes, including default and split dropdown buttons.